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From:   Li Nan <linan122@huawei.com>
To:     <tj@kernel.org>, <josef@toxicpanda.com>, <axboe@kernel.dk>
CC:     <cgroups@vger.kernel.org>, <linux-block@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linan122@huawei.com>,
        <yukuai3@huawei.com>, <yi.zhang@huawei.com>
Subject: [PATCH -next v2 3/9] blk-iocost: don't allow to configure bio based device
Date:   Wed, 30 Nov 2022 21:21:50 +0800
Message-ID: <20221130132156.2836184-4-linan122@huawei.com>
In-Reply-To: <20221130132156.2836184-1-linan122@huawei.com>
References: <20221130132156.2836184-1-linan122@huawei.com>
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From: Yu Kuai <yukuai3@huawei.com>

iocost is based on rq_qos, which can only work for request based device,
thus it doesn't make sense to configure iocost for bio based device.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Li Nan <linan122@huawei.com>
---
 block/blk-iocost.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index c532129a1456..bc6522bb314d 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3181,6 +3181,11 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
 		return PTR_ERR(bdev);
 
 	disk = bdev->bd_disk;
+	if (!queue_is_mq(disk->queue)) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
 	ioc = q_to_ioc(disk->queue);
 	if (!ioc) {
 		ret = blk_iocost_init(disk);
@@ -3364,6 +3369,11 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
 		return PTR_ERR(bdev);
 
 	q = bdev_get_queue(bdev);
+	if (!queue_is_mq(q)) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
 	ioc = q_to_ioc(q);
 	if (!ioc) {
 		ret = blk_iocost_init(bdev->bd_disk);
-- 
2.31.1